I am putting my 300d back on the road again after sitting in my barn for the last three years (not me, the car.) I noticed that there was fuel on the concrete below the fuel tank and investigated. It appears to leaking from a very large set screw at the center bottom of the tank and I am assuming that it is the fuel screen after looking at the photo at Fastlane, is this a correct assumption? If so, I bet it just needs a new o ring, but feel that I should just replace the entire unit. If this is the fuel screen, how does it work?

Thanks,
Brian